Touched up ^ twigil example

Closes #1353

Author: Jan-Olof Hendig

doc/Language/variables.pod6

@@ -315,11 +315,9 @@ subroutines.  Variables of the form C<$^variable> are a type of placeholder
 variable. They may be used in bare blocks to declare formal parameters to
 that block. So the block in the code
 
-    my @powers-of-three = 1,3,9…100
-    say reduce { $^b - $^a }, 0, |@powers-of-three
-    
-    # OUTPUT:
-    # 61
+    my @powers-of-three = 1,3,9…100;
+    say reduce { $^b - $^a }, 0, |@powers-of-three;
+    # OUTPUT: «61␤»
 
 has two formal parameters, namely C<$a> and C<$b>. Note that even though C<$^b>
 appears before C<$^a> in the code, C<$^a> is still the first formal parameter